WO2011047569A1 - 一种紧急呼叫用户切换的方法和装置 - Google Patents

一种紧急呼叫用户切换的方法和装置 Download PDF

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Publication number
WO2011047569A1
WO2011047569A1 PCT/CN2010/075369 CN2010075369W WO2011047569A1 WO 2011047569 A1 WO2011047569 A1 WO 2011047569A1 CN 2010075369 W CN2010075369 W CN 2010075369W WO 2011047569 A1 WO2011047569 A1 WO 2011047569A1
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Prior art keywords
user
target cell
emergency call
information
call indication
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PCT/CN2010/075369
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English (en)
French (fr)
Inventor
胡海鹏
易鸿锋
王琴
陈东丽
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中兴通讯股份有限公司
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Publication of WO2011047569A1 publication Critical patent/WO2011047569A1/zh

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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W4/00Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/90Services for handling of emergency or hazardous situations, e.g. earthquake and tsunami warning systems [ETWS]
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W76/00Connection management
    • H04W76/50Connection management for emergency connections
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W48/00Access restriction; Network selection; Access point selection
    • H04W48/20Selecting an access point

Definitions

  • the present invention relates to user handover techniques, and more particularly to a method and apparatus for emergency call users to switch. Background technique
  • the quality of service of wireless networks is becoming more and more important.
  • One aspect of the quality of network services is the success rate of handover.
  • the timeliness of handover must be guaranteed, that is, the handover delay of emergency call users is reduced, and the handover success rate is improved.
  • LTE Long Term Evolution
  • SIB2 System Information Block2
  • ac-Barringlnfo Access Class-BarringInfo
  • ac-BarringForEmergency value that is, 1
  • AC Access Class
  • no emergency call if the user has one or more access levels and the access level is between 11 and 15,
  • ac-BarringForSpecialAC the value of "Special AC Prohibited Call Indication" in its broadcast message is 0 at the corresponding AC level, the cell is allowed to make an emergency call.
  • ac-BarringForSpecialAC is a bit of length 5, which is expressed in binary form. From left to right, it represents the prohibition information of AC level 11 to 15, respectively. If it is 0, it means that the corresponding AC is prohibited. Indicates a ban. If the value of ac-BarringForSpecialAC is '10001, it means that the cell has an AC level of 11 to 15, and is forbidden to access. That is to say, the ac-BarringForSpecialAC information is only relevant to users whose AC is 11 to 15.
  • the user's access level information exists in the user identity module (SIM, Subscriber Identity Module) card.
  • SIM Subscriber Identity Module
  • the user identity module As long as the user is a subscription user (ie, a user with a SIM card), one or more AC information will be owned. During the process, the user's AC information remains unchanged. Users with an AC of 0 to 9 are ordinary users, and users with an AC of 11 to 15 are special users.
  • the existing handover method does not consider the "prohibited emergency call indication” and the "special AC prohibition call indication" of the target cell when selecting the target cell, that is, the switching success rate and handover time of the emergency call user are not considered when the indication information is not considered. The impact of the delay.
  • the user When the user is in the handover area, the user selects a cell with the best quality of service, that is, the cell with the strongest signal quality as the target cell of the handover, and then notifies the user to perform the handover. However, if the "prohibited emergency call indication" and the “special AC prohibited call indication” of the cell and the AC information of the user are not considered in selecting the target cell, "the emergency call indication is prohibited” or "the corresponding AC of the user” is selected. The special AC prohibits the call indication. "The cell with 1 is the UE. When the UE makes emergency call access, it will find that the cell is forbidden to access, and then inform the source eNB.
  • the source eNB must re-select a cell with the best quality of service, that is, the signal with the strongest signal. If the cell still selects a similar cell at this time, the source eNB continues to reselect an optimal target cell. In the long run, the success rate of the emergency call of the user will be greatly reduced, and the handover delay will be increased. Summary of the invention
  • an aspect of the present invention provides a method for emergency call user handover, including the following steps: a source eNB selects a cell with the strongest signal as a candidate target cell; and the source eNB acquires an emergency call for the candidate target cell.
  • the "and" special AC prohibition call indication" and the user's AC information are indicated; the source eNB selects the handover target cell for the user according to the acquired "prohibited emergency call indication" and "special AC prohibited call indication” and the user's AC information.
  • the method for obtaining the "Forbidden Emergency Call Indication" and the "Special AC Prohibited Call Indication” includes: when establishing an X2 port connection, the eNB acquires by local storage, or acquires by the UE to report the source eNB.
  • the method for acquiring user AC information includes: the eNB requests the AC information of the user from the core network.
  • the method for acquiring user AC level information further includes: the UE reporting its own AC information when establishing a radio resource connection (RRC).
  • RRC radio resource connection
  • the user includes: a subscription user and a non-subscription user; wherein, the subscription user refers to a user who has a SIM card, and the non-subscription user refers to a user who does not have a SIM card.
  • the eNB determines whether the value of the "prohibited emergency call indication" of the candidate target cell is true, and if true, does not use the cell as the handover target cell. If it is false, the cell is used as the handover target cell.
  • the specific method for selecting a handover target cell for the subscription user is:
  • the eNB determines the value of the "Forbidden Emergency Call Indication" of the candidate cell, and if it is false, uses the cell as the handover target cell;
  • Another aspect of the present invention provides an apparatus for emergency call user handover, including: a selection module, where a eNB selects a cell with the strongest signal as a candidate target cell; and an acquiring module, configured by the eNB to acquire the candidate target cell.
  • the emergency call indication "and the special AC prohibition call indication" and the user's AC information are prohibited;
  • the obtaining, by the acquiring module, the information of the "forbidden emergency call indication" and the "special AC prohibition call indication" includes: when the X2 interface is established, the eNB obtains the information through local storage, or obtains the report through the UE.
  • the obtaining, by the acquiring module, the AC information of the user includes: acquiring, by the eNB, the AC information of the user, or by the UE, when the RRC connection is established.
  • the source eNB when selecting a target cell to be handed over, not only considers the strength of the cell signal, but also considers "prohibited emergency call indication" and "special AC prohibition".
  • the call indication and the user's AC information enable the emergency call user to switch in a very timely manner and greatly improve the success rate of the handover.
  • Figure 1 is a schematic diagram of the process of the handover preparation phase.
  • FIG. 2 is a schematic diagram of an acquisition and update process of an inter-eNB cell "Forbidden Emergency Call Indication" and "Special AC Prohibited Call Indication”.
  • FIG. 3 is a schematic diagram of the “Forbidden Emergency Call Indication” and “Special AC Prohibited Call Indication” information of the candidate target cell on the UE.
  • FIG. 4 is a schematic flowchart of an eNB acquiring AC information by using a core network to identify a user state.
  • FIG. 5 is a schematic diagram of a process for an eNB to obtain AC information by using a user report information to identify a user state.
  • 6 is a schematic diagram of a process in which an eNB selects a target handover cell for an unlicensed user.
  • FIG. 7 is a schematic diagram of a process in which an eNB selects a target handover cell for a subscribed user.
  • FIG. 8 is a schematic structural diagram of an apparatus for emergency call user switching according to the present invention. detailed description
  • the basic idea of the present invention is: the source eNB selects the cell with the strongest signal as the handover candidate target cell; the source eNB acquires the "prohibited emergency call indication" and the “special AC barring call indication” of the candidate target cell and the AC information of the user; The handover target cell is selected for the emergency call user according to the acquired "Forbidden Emergency Call Indication" and "Special AC Prohibited Call Indication” and the user's AC information.
  • Figure 1 depicts the process of the handover preparation phase. As shown in Figure 1, the following steps are included:
  • Step 101 The UE measures the service quality of the current cell and the neighboring cell, and finds that the service quality of the current cell is higher than the service quality of the neighboring cell, and does nothing; if the quality of the current cell is lower than the service quality of the neighboring cell, the step is performed. 102;
  • Step 102 The UE reports the measurement result to the eNB.
  • Step 103 The measurement information reported by the UE includes measurement results for multiple neighboring cells, and the eNB selects the cell with the best service quality, that is, the strongest signal, and the cell B with the best signal quality as shown in FIG. 3, as the candidate target cell. ;
  • the source eNB selects the cell B with the strongest signal, that is, the cell with the largest RSRP value, by determining the reference signal received power value (RSRP, Reference Signal Receive Power).
  • RSRP Reference Signal Receive Power
  • Step 104 The eNB acquires and stores the "Forbidden Emergency Call Indication", "Special AC Prohibited Call Indication” information of the candidate target cell, and AC information of the user;
  • Step 105 The eNB determines, according to the acquired "Blocking Emergency Call Indication" and "Special AC Prohibited Call Indication" information of the cell B, whether the cell can serve as a handover target cell of the user; if yes, the eNB uses the cell as a handover candidate cell. And notifying the user to switch to the cell; If not, the eNB deletes the cell from the candidate list.
  • the eNB obtains two methods of "forbidden emergency call indication" and "special AC forbidden call indication” information of the candidate target cell, and one type of target eNB through which the source eNB and the candidate target cell belong. Obtained when establishing an X2 port connection; another type of information that can be used by the UE to measure the candidate target cell.
  • Figure 2 illustrates the process of obtaining the "Forbidden Emergency Call Indication" and "Special AC Prohibited Call Indication” information of the cell between the two eNBs during the X2 interaction process, including:
  • the eNB1 sends an X2 setup request message to the eNB2, where the message includes "prohibited emergency call indication” and "special AC prohibition call indication" of each cell in the eNB1;
  • the eNB2 locally saves the "Forbidden Emergency Call Indication” and the "Special AC Prohibited Call Indication” of each cell in the eNB1, and sends an X2 Setup Response message to the eNB1, where the message includes "prohibited emergency call” for each cell in the eNB2. Instructing "and” special AC forbidden call indication”; (3) “Allow emergency call indication” and “Special AC prohibited call indication” for each cell in eNB1 eNB2 for local storage;
  • eNB2 When a "prohibited emergency call indication" or “special AC prohibited call indication” of at least one cell in eNB2 (or eNB1) changes, eNB2 (or eNB1) actively sends an X2 update message to eNB1 (or eNB2);
  • eNB1 After receiving the X2 update message of eNB2 (or eNB1), eNB1 (or eNB2) saves the latest "prohibited emergency call indication" and "special AC prohibited call indication" of each cell in eNB2 (or eNB1).
  • FIG. 3 illustrates a process in which the UE measures the "Forbidden Emergency Call Indication" and "Special AC Prohibited Call Indication” information of the candidate target cell, including:
  • Step 301 The UE finds the cell B with the strongest signal, and sends the cell B to the source cell.
  • Middle cell unique identifier ECGI, EUTRAN Cell Gloab Identity
  • Step 303 The UE reads the broadcast information of the cell B, and obtains the “prohibited emergency call indication”, the “special AC forbidden call indication”, and the ECGI information of the cell B.
  • Step 304 1 ⁇ >3 ⁇ 4 Cell 8 "Prohibited Emergency Call Indication", “Special AC Prohibited Call Indication” and ECGI information.
  • the method for the source eNB to acquire the AC information of the user includes: one method is obtained through the core network; and the other case is required to be reported by the user when establishing a radio resource connection (RRC) Its own AC information.
  • RRC radio resource connection
  • the user is divided into a subscription user and a non-subscription user.
  • the subscription user refers to a user who has a SIM card
  • the non-subscription user refers to a user who does not have a SIM card.
  • FIG. 4 illustrates a process for an eNB to obtain user AC information through a core network, including: Step 401: An eNB requests an AC level information of a user from a core network.
  • Step 402 the eNB determines whether the user AC information is successful, if successful, step 403; otherwise, step 404 is performed;
  • the eNB may determine, in the form of message interaction, whether the acquisition of the user AC information is successful.
  • Step 403 The eNB marks the user as a subscription user, and saves the corresponding AC information of the user.
  • FIG. 5 illustrates a process of reporting the AC information of the user when the RRC connection is established, including: Step 501: The user reports the AC information of the user when establishing the RRC connection.
  • the user carries its own AC information when initiating an RRC connection request.
  • Step 502 the eNB determines whether the user AC level information is successful, if successful, step 503 is performed; otherwise, step 504 is performed;
  • the eNB determines whether the acquisition of the AC information is successful by whether the AC information is carried in the establishment of the RRC connection request message.
  • Step 503 The eNB marks the user as a subscription user, and saves the corresponding AC level information of the user.
  • Step 504 The eNB marks the user as an unlicensed user (there is no access level user;); the present invention is further described below in conjunction with specific embodiments:
  • the user includes: a subscription user and a non-subscription user; wherein, the subscription user refers to a user who has a SIM card, and the non-subscription user refers to a user who does not have a SIM card.
  • FIG. 6 shows a process in which an eNB selects a handover target cell for an unlicensed user.
  • the "prohibited emergency call indication" information is considered, and if it is not, it is used as a handover target cell, and if it is true, it is not used as a handover.
  • the target cell has nothing to do with the value of "Special AC Prohibited Call Indication". As shown in Figure 6, the specific includes:
  • Step 601 The eNB determines, according to the "Forbidden Emergency Call Indication" information of the candidate cell that is stored by the eNB, whether the value of the "Forbidden Emergency Call" of the candidate cell is true; if true, step 603 is performed; otherwise, step 602 is performed;
  • Step 602 The eNB uses the cell as a handover target cell of the user.
  • Step 603 The eNB does not use the cell as the handover target cell of the user.
  • FIG. 7 shows a process for the eNB to select a handover target cell for the subscribed user, which specifically includes: Step 701: The eNB determines, according to the information of the candidate cell “disable emergency call indication” stored by the eNB, the “Forbidden Emergency Call Indication” value of the candidate cell. Whether it is true; if true, step 702; otherwise, step 704 is performed;
  • Step 702 the eNB determines whether the AC level of the user is between 11 and 15; if yes, step 703 is performed; otherwise, step 705 is performed;
  • Step 703 The eNB determines, according to the “Special AC Prohibited Call Indication” information of the candidate cell that is stored by the eNB and the AC level information of the user, that the corresponding AC level of the user is corresponding in the candidate cell. Whether the flag is true, if all are true, step 705 is performed; otherwise, step 704 is performed;
  • Step 704 The eNB uses the cell as a handover target cell of the user.
  • Step 705 The eNB does not use the cell as the handover target cell of the user.
  • FIG. 8 is a schematic structural diagram of an apparatus for emergency call user handover according to the present invention.
  • the apparatus for emergency call user handover of the present invention includes a selection module, an acquisition module, and a determination selection module, wherein the selection module is used for The eNB selects the cell with the strongest signal as the candidate target cell; the acquiring module is used by the eNB to acquire the "Forbidden Emergency Call Indication" and the "Special AC Prohibited Call Indication” of the candidate target cell and the AC information of the user; The source eNB selects a handover target cell for the user according to the acquired "Forbidden Emergency Call Indication" and "Special AC Prohibited Call Indication” and the user's AC information.
  • the obtaining module obtains the information of the "forbidden emergency call indication" and the "special AC forbidden call indication".
  • the information is obtained by the eNB through local storage or by the UE measurement and reporting.
  • the obtaining, by the acquiring module, the AC information of the user includes: the eNB requests the acquisition from the core network, or reports the AC information of the UE when the RRC connection is established.

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Description

一种紧急呼叫用户切换的方法和装置 技术领域
本发明涉及用户切换技术, 尤其涉及一种紧急呼叫用户进行切换的方 法和装置。 背景技术
随着移动通信行业的发展, 用户对网络质量需求的提高, 无线网络的 服务质量愈加显得重要。 网络服务质量好坏的一个体现方面就是切换成功 率, 尤其是对于紧急呼叫的用户, 必须保证切换的及时性, 即减少紧急呼 叫用户的切换时延, 提高切换成功率。
根据当前长期演进( LTE , Long Term Evolution ) 系统协议规范, 对于 一个紧急呼叫,如果当前小区的广播消息( SIB2, System Information Block2 ) 中存在接入等级禁止信息(ac-Barringlnfo, Access Class-Barringlnfo )信元, 当 "禁止紧急呼叫指示" ( ac-BarringForEmergency )值为否 (即为 0 ) 时, 才允许紧急呼叫接入, 否则, 当 ac-BarringForEmergency值为真 (即为 1 ) 时, 如果用户没有接入等级(AC , Access Class ) (即无 SIM卡), 是不允 许紧急呼叫接入的; 如果用户存在一种或多种接入等级, 且满足接入等级 在 11 至 15 之间, 当其广播消息中的 "特殊 AC 禁止呼叫指示" ( ac-BarringForSpecialAC )的值在相应 AC等级上为 0时,该小区是允许该 用户进行紧急呼叫的。
ac-BarringForSpecialAC的值是长度为 5的比特位, 釆用二进制的形式 表示,从左到右分别代表了 AC等级为 11至 15的禁止信息,如果为 0表示 不对相应的 AC禁止, 为 1则表示禁止。 如 ac-BarringForSpecialAC的值为 '10001,, 就表示该小区对 AC等级为 11至 15的用户, 是禁止接入的, 也 就是说 ac-BarringForSpecialAC信息只与 AC为 11至 15的用户相关。
用户的接入等级信息存在于用户的用户身份模块 (SIM , Subscriber Identity Module )卡中, 只要用户为签约用户 (即有 SIM卡的用户)就会拥 有 1个或多个 AC信息, 在一次签约过程中, 用户的 AC信息保持不变。 其 中 AC为 0至 9的用户为普通用户, AC为 11至 15的用户为特殊用户。
而目前存在的切换方法在选择目标小区的时候都没有考虑目标小区的 "禁止紧急呼叫指示" 和 "特殊 AC禁止呼叫指示", 即没有考虑这些指示 信息对紧急呼叫用户的切换成功率和切换时延的影响。
当用户处于切换区域的时候,用户通过测量上报,源演进型节点(eNB, evolution NodeB )选择一个服务质量最好的小区即信号最强的小区作为切换 的目标小区, 然后通知用户进行切换。 但是如果在选择目标小区时不考虑 小区的 "禁止紧急呼叫指示" 和 "特殊 AC禁止呼叫指示" 以及用户的 AC 信息, 而选择了 "禁止紧急呼叫指示" 为 1或者用户的 AC所对应的 "特殊 AC禁止呼叫指示" 为 1的小区, UE进行紧急呼叫接入的时候会发现该小 区禁止接入, 然后通知源 eNB, 源 eNB必须重新再选择一个服务质量最好 的小区即信号最强的小区,如果这个时候仍然选择了一个类似小区,源 eNB 继续重新选择一个最优目标小区, 长此以往势必会大大降低用户紧急呼叫 的切换成功率, 增加切换时延。 发明内容
有鉴于此, 本发明的要解决的技术问题时提供一种紧急呼叫用户切换 的方法, 在切换过程中, 源 eNB在为紧急呼叫用户选择目标小区时, 同时 考虑用户的 AC信息和小区的 "禁止紧急呼叫指示"和 "特殊 AC禁止呼叫 指示", 为紧急呼叫用户选择最可靠切换的小区, 从而保证紧急呼叫用户的 切换及时性, 提高切换成功率和减少切换时延的目的。 为了解决上述问题, 本发明一方面提供了一种紧急呼叫用户切换的方 法,包括以下步骤:源 eNB选取信号最强的小区作为候选目标小区;源 eNB 获取所述候选目标小区的 "禁止紧急呼叫指示"和 "特殊 AC禁止呼叫指示" 以及 用户的 AC信息;源 eNB根据获取的所述"禁止紧急呼叫指示"和 "特 殊 AC禁止呼叫指示" 以及用户的 AC信息, 为用户选择切换目标小区。
进一步地,所述获取 "禁止紧急呼叫指示"和 "特殊 AC禁止呼叫指示" 的方法包括: 建立 X2口连接时, eNB通过本地保存获取, 或者通过 UE测 量上报源 eNB获取。
进一步地, 所述获取用户 AC信息的方法包括: eNB向核心网请求用 户的 AC信息。
进一步地, 所述获取用户 AC等级信息的方法还包括: UE在建立无线 资源连接 ( RRC ) 时上报自身的 AC信息。
进一步地, 所述用户包括: 签约用户和非签约用户; 其中, 所述签约 用户是指有 SIM卡的用户, 所述非签约用户是指没有 SIM卡的用户。
进一步地, 所述为非签约用户选择切换目标小区的具体方法为: eNB 判断候选目标小区的 "禁止紧急呼叫指示" 的值是否为真, 如果为真, 则 不将所述小区作为切换目标小区; 如果为假, 则将所述小区作为切换目标 小区。
进一步地, 所述为签约用户选择切换目标小区的具体方法为:
eNB 判断候选小区的 "禁止紧急呼叫指示" 的值, 如果为假, 则将所 述小区作为切换目标小区;
如果为真, 则进一步判断该用户的 AC等级是否在 11至 15之间,如果 不是, 则不将所述小区作为切换目标小区;
如果是, 则进一步判断该用户的 AC等级相对应的 "特殊 AC禁止呼叫 指示" 的值是否都为真, 如果是, 则不将所述小区作为切换目标小区; 如 果不是, 则将所述小区作为切换目标小区。
本发明另一方面还提供了一种紧急呼叫用户切换的装置, 包括: 选取模块, 用于 eNB选取信号最强的小区作为候选目标小区; 获取模块, 用于 eNB获取所述候选目标小区的 "禁止紧急呼叫指示" 和 "特殊 AC禁止呼叫指示" 以及用户的 AC信息;
判断选择模块, 用于源 eNB根据获取的所述 "禁止紧急呼叫指示" 和 "特殊 AC禁止呼叫指示"以及用户的 AC信息,为用户选择切换目标小区。
进一步地, 所述获取模块获取 "禁止紧急呼叫指示"和 "特殊 AC禁止 呼叫指示"信息包括: 建立 X2口连接时, eNB通过本地保存获取, 或者通 过 UE测量上报获取。
进一步地, 所述获取模块获取用户的 AC信息包括: eNB向核心网请 求获取, 或者通过 UE在建立 RRC连接时上报自身的 AC信息。
与现有技术相比, 本发明的紧急呼叫用户切换的方法, 源 eNB在选择 切换的目标小区时, 不仅考虑了小区信号的强弱, 同时考虑了 "禁止紧急 呼叫指示"和 "特殊 AC禁止呼叫指示"和用户的 AC信息, 使得紧急呼叫 用户可以非常及时进行切换, 并且大大提高了切换的成功率。 附图说明
图 1为切换准备阶段的流程示意图。
图 2为 eNB间小区 "禁止紧急呼叫指示"和 "特殊 AC禁止呼叫指示" 获取和更新过程示意图。
图 3为 UE上 ^艮候选目标小区的 "禁止紧急呼叫指示"和 "特殊 AC禁 止呼叫指示" 信息的示意图。
图 4为 eNB通过核心网标识用户状态获取 AC信息的流程示意图。 图 5为 eNB通过用户上报信息标识用户状态获取 AC信息的流程示意 图。 图 6为 eNB为未签约用户选择目标切换小区的流程示意图。 图 7为 eNB为已签约用户选择目标切换小区的流程示意图。
图 8为本发明紧急呼叫用户切换的装置结构示意图。 具体实施方式
本发明的基本构思是: 源 eNB选取信号最强的小区作为切换候选目标 小区; 源 eNB获取候选目标小区的 "禁止紧急呼叫指示" 和 "特殊 AC禁 止呼叫指示"和用户的 AC信息; 源 eNB根据获取的 "禁止紧急呼叫指示" 和 "特殊 AC禁止呼叫指示"和用户的 AC信息, 为紧急呼叫用户选择切换 目标小区。
以 LTE系统内 X2 口切换为例, 图 1描述了切换准备阶段的过程示意 图, 如图 1所示, 包括以下步骤:
步骤 101 : UE测量当前小区和邻区的服务质量, 发现当前小区的服务 质量高于邻区的服务质量, 则什么也不做; 发现当前小区的质量低于邻区 的服务质量, 则执行步骤 102;
步骤 102: UE上报测量结果给 eNB;
步骤 103: UE上报的测量信息里包含对多个邻区的测量结果, eNB选 取服务质量最好即信号最强的小区, 如图 3所示的信号质量最好的小区 B, 作为候选目标小区;
具体地,源 eNB通过判断参考信号接收功率值( RSRP, Reference Signal Receive Power )选取出信号最强的小区 B, 即 RSRP值最大的小区。
步骤 104: eNB获取并存储候选目标小区的 "禁止紧急呼叫指示"、 "特 殊 AC禁止呼叫指示" 信息和用户的 AC信息;
步骤 105: eNB根据获取到的小区 B的 "禁止紧急呼叫指示" 和 "特 殊 AC禁止呼叫指示" 信息判断该小区是否可以作为用户的切换目标小区; 如果是, 则 eNB将该小区作为切换候选小区, 并通知用户切换到该小区; 如果不是, 则 eNB将该小区从候选列表中删除。
具体地, 上述步骤 104中, eNB获取候选目标小区的 "禁止紧急呼叫 指示" 和 "特殊 AC 禁止呼叫指示" 信息的方法有两种, 一种可以通过源 eNB与候选目标小区所归属的目标 eNB在建立 X2口连接时获取; 另外一 种可以通过 UE测量上 ^艮候选目标小区的信息。
图 2描述了两个 eNB之间在 X2交互过程中获取小区的 "禁止紧急呼 叫指示" 和 "特殊 AC禁止呼叫指示" 信息的过程, 包括:
( 1 ) eNBl向 eNB2发送 X2建立请求消息, 该消息中包含 eNBl内各 小区的 "禁止紧急呼叫指示" 和 "特殊 AC禁止呼叫指示";
( 2 ) eNB2将 eNBl内各小区的 "禁止紧急呼叫指示" 和 "特殊 AC禁 止呼叫指示" 进行本地保存, 并向 eNBl发送 X2建立响应消息, 该消息中 包含 eNB2内各小区的 "禁止紧急呼叫指示"和 "特殊 AC禁止呼叫指示"; ( 3 ) eNBl eNB2内各小区的 "禁止紧急呼叫指示" 和 "特殊 AC禁 止呼叫指示" 进行本地保存;
( 4 ) 当 eNB2 (或 eNBl ) 内至少有一个小区的 "禁止紧急呼叫指示" 或 "特殊 AC禁止呼叫指示" 发生变化时, eNB2 (或 eNBl )主动向 eNBl (或 eNB2 )发送 X2更新消息;
( 5 ) eNBl (或 eNB2 )收到 eNB2 (或 eNBl ) 的 X2更新消息后, 保 存 eNB2 (或 eNBl ) 内各小区的最新 "禁止紧急呼叫指示" 和 "特殊 AC 禁止呼叫指示"。
图 3描述了 UE测量上 ^艮候选目标小区的 "禁止紧急呼叫指示"和 "特 殊 AC禁止呼叫指示" 信息的过程, 包括:
步骤 301 , UE发现信号最强的小区 B, 并将其上^艮给源小区; 步骤 302, 源小区通知 UE上报小区 B的 "禁止紧急呼叫指示"、 "特殊 AC禁止呼叫指示"和演进网络中小区唯一标识( ECGI, EUTRAN Cell Gloab Identity )信息;
步骤 303 , UE读取小区 B的广播信息, 获取小区 B的 "禁止紧急呼叫 指示"、 "特殊 AC禁止呼叫指示" 和 ECGI信息;
步骤 304, 1^上>¾小区8的 "禁止紧急呼叫指示"、 "特殊 AC禁止呼 叫指示" 和 ECGI信息。
具体地, 上述步骤 304中, 源 eNB获取用户的 AC信息的方法包括: 一种方法是通过核心网来获取; 另一种情况是需要用户在建立无线资源连 接 ( RRC, Radio Resource connection ) 时上报自身的 AC信息。
用户分为签约用户和非签约用户,所述签约用户是指有 SIM卡的用户, 所述非签约用户是指没有 SIM卡的用户。
图 4描述了 eNB通过核心网获取用户 AC信息的过程, 包括: 步骤 401 , eNB向核心网请求用户的 AC等级信息;
步骤 402, eNB判断获取用户 AC信息是否成功, 如果成功, 执行步骤 403; 否则执行步骤 404;
具体地, eNB可以通过消息交互的形式判断得知获取用户 AC信息是 否成功。
步骤 403 , eNB标记该用户为签约用户,并保存该用户相应的 AC信息; 步骤 404, eNB标记该用户为未签约用户 (没有接入等级用户)。
图 5描述了用户在建立 RRC连接时上报自身的 AC信息的过程,包括: 步骤 501 , 用户在建立 RRC连接时上报自身的 AC信息;
具体地, 用户在发起 RRC连接请求时携带自身的 AC信息。
步骤 502, eNB判断获取用户 AC等级信息是否成功, 如果成功, 执行 步骤 503; 否则执行步骤 504;
具体地, eNB通过在建立 RRC连接请求消息中是否携带 AC信息判断 获取 AC信息是否成功。 步骤 503 , eNB标记该用户为签约用户, 并保存用户相应的 AC等级信 息;
步骤 504, eNB标记该用户为未签约用户 (没有接入等级用户;); 下面结合具体的实施例来进一步说明本发明:
用户包括: 签约用户和非签约用户; 其中, 签约用户是指有 SIM卡的 用户, 非签约用户是指没有 SIM卡的用户。
方法实施例 1
图 6示出了 eNB为未签约用户选取切换目标小区的过程, 对未签约用 户, 只考虑 "禁止紧急呼叫指示" 信息, 只要为否, 就作为切换目标小区, 只要为真,就不作为切换目标小区,与 "特殊 AC禁止呼叫指示"的值无关。 如图 6所示, 具体包括:
步骤 601 , eNB根据自身存储的候选小区的 "禁止紧急呼叫指示"信息, 判断候选小区的 "禁止紧急呼叫"的值是否为真; 如果为真,执行步骤 603; 否则执行步骤 602;
步骤 602, eNB将该小区作为该用户的切换目标小区;
步骤 603 , eNB不将该小区作为该用户的切换目标小区。
方法实施例 2
图 7示出了为 eNB为已签约用户选取切换目标小区的过程,具体包括: 步骤 701 , eNB根据自身存储的候选小区 "禁止紧急呼叫指示" 信息, 判断候选小区的 "禁止紧急呼叫指示" 值是否为真; 如果为真, 执行步骤 702; 否则执行步骤 704;
步骤 702, eNB判断该用户的 AC等级是否在 11至 15之间; 如果是, 执行步骤 703; 否则执行步骤 705;
步骤 703 , eNB根据自身存储的候选小区的 "特殊 AC禁止呼叫指示" 信息和用户的 AC等级信息,判断该用户相应的 AC等级在候选小区中相应 标记是否都为真, 如果都为真, 则执行步骤 705; 否则执行步骤 704;
步骤 704, eNB将该小区作为该用户的切换目标小区;
步骤 705, eNB不将该小区作为该用户的切换目标小区。
装置实施例
图 8示出了本发明的紧急呼叫用户切换的装置结构示意图, 如图 8所 示, 本发明的紧急呼叫用户切换的装置包括选取模块、 获取模块和判断选 择模块, 其中, 选取模块, 用于 eNB选取信号最强的小区作为候选目标小 区; 获取模块, 用于 eNB获取所述候选目标小区的 "禁止紧急呼叫指示" 和 "特殊 AC禁止呼叫指示" 以及用户的 AC信息; 判断选择模块, 用于源 eNB根据获取的所述 "禁止紧急呼叫指示" 和 "特殊 AC禁止呼叫指示" 以及用户的 AC信息, 为用户选择切换目标小区。
其中,获取模块获取 "禁止紧急呼叫指示"和 "特殊 AC禁止呼叫指示" 信息包括: 建立 X2口连接时, eNB通过本地保存获取, 或者通过 UE测量 上报获取。
其中, 获取模块获取用户的 AC信息包括: eNB向核心网请求获取, 或者通过 UE在建立 RRC连接时上报自身的 AC信息。
以上详细说明了本发明的原理, 但这只是为了便于理解而举的一些实 施例, 并不构成对本发明保护范围的限定。 在不背离本发明精神及实质的 这些相应的改变和变形都属于本发明所付的权利要求的保护范围。

Claims

权利要求书
1、 一种紧急呼叫用户切换的方法, 其特征在于, 所述方法包括: 源演进型节点 (eNB )选取信号最强的小区作为候选目标小区; 源 eNB 获取所述候选目标小区的禁止紧急呼叫指示和特殊接入等级 ( AC )禁止呼叫指示, 以及用户的 AC信息;
源 eNB根据获取的所述禁止紧急呼叫指示和所述特殊 AC禁止呼叫指 示, 以及所述用户的 AC信息, 为所述用户选择切换目标小区。
2、 根据权利要求 1所述的紧急呼叫用户切换的方法, 其特征在于, 所 述源 eNB获取禁止紧急呼叫指示和特殊 AC禁止呼叫指示信息为:
建立 X2 口连接时, 所述源 eNB通过本地保存的所述候选目标小区的 禁止紧急呼叫指示信息和特殊 AC禁止呼叫指示信息而获取, 或者, UE测 量所述候选目标小区的禁止紧急呼叫指示和特殊 AC禁止呼叫指示后,上才艮 给所述源 eNB。
3、 根据权利要求 1所述的紧急呼叫用户切换的方法, 其特征在于, 所 述获取用户 AC信息为:
所述源 eNB向核心网请求获取用户的 AC信息, 所述核心网将所述用 户的 AC信息发送给所述源 eNB。
4、 根据权利要求 1所述的紧急呼叫用户切换的方法, 其特征在于, 所 述获取用户 AC等级信息为:
所述 UE在建立无线资源连接 ( RRC ) 时, 向所述源 eNB上报自身的 AC信息。
5、 根据权利要求 1至 4任一项所述的紧急呼叫用户切换的方法, 其特 征在于, 所述用户包括签约用户和非签约用户; 其中, 所述签约用户为有 用户身份模块 SIM卡的用户, 所述非签约用户为没有 SIM卡的用户。
6、 根据权利要求 5所述的紧急呼叫用户切换的方法, 其特征在于, 为 非签约用户选择切换目标小区为:
所述源 eNB判断候选目标小区的禁止紧急呼叫指示的值为真时, 不将 所述候选目标小区作为切换目标小区; 否则将所述候选目标小区作为切换 目标小区。
7、 根据权利要求 6所述的紧急呼叫用户切换的方法, 其特征在于, 为 签约用户选择切换目标小区为:
所述源 eNB判断候选小区的禁止紧急呼叫指示的值为假时, 将所述候 选目标小区作为切换目标小区; 为真时,进一步判断该用户的 AC等级不在 11至 15之间时, 不将所述候选目标小区作为切换目标小区; 该用户的 AC 等级在所述 11至 15之间时,再进一步判断与该用户的 AC等级对应的特殊 AC禁止呼叫指示的值为真时, 不将所述候选目标小区作为切换目标小区; 特殊 AC 禁止呼叫指示的值为假时, 将所述候选目标小区作为切换目标小 区。
8、 一种紧急呼叫用户切换的装置, 其特征在于, 所述装置包括选取模 块、 获取模块和获取模块; 其中:
选取模块, 用于选取信号最强的小区作为候选目标小区;
获取模块,用于获取所述候选目标小区的禁止紧急呼叫指示和特殊 AC 禁止呼叫指示, 以及用户的 AC信息;
判断选择模块, 用于源 eNB根据获取的所述禁止紧急呼叫指示和特殊
AC禁止呼叫指示, 以及用户的 AC信息, 为用户选择切换目标小区。
9、 根据权利要求 8所述的紧急呼叫用户切换的装置, 其特征在于, 所 述获取模块进一步在建立 X2 口连接时, 通过源 eNB本地保存的所述候选 目标小区的禁止紧急呼叫指示信息和特殊 AC禁止呼叫指示信息而获取,或 者通过 UE测量所述候选目标小区的禁止紧急呼叫指示和特殊 AC禁止呼叫 指示后上报所述获取模块而获取。
10、 根据权利要求 8所述的紧急呼叫用户切换的装置, 其特征在于, 所述获取模块进一步向核心网请求获取用户的 AC信息,核心网向所述获取 模块发送所述用户的 AC信息; 或者, UE在建立 RRC连接时, 向所述获 取模块上报自身的 AC信息。
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